Soil sampling device for drilling

Abstract

The invention relates to a soil sampling device for drilling, which comprises an outer drill rod, a sampling rod, an outer sampling pipe, a sampling drill bit, a sealing pipe, a sealing sleeve, an elastic binding belt, a cutting rod and the like, and is characterized in that the foldable sealing sleeve is gradually unfolded along with the entering process of a soil sample, and then the elastic binding belt is tightened to realize effective sample sealing; the overturning type cutting-off rod is driven by the sampling drill bit to evenly cut off a soil sample, disturbance is reduced, the sliding groove is formed between the sealing pipe and the guide rod to prevent mutual rotation, sealing liquid can be provided for the drill bit and the drill block through the through hole, abrasion is reduced, external pollution is blocked, and the device is compact in structure, convenient to install and disassemble, high in sampling efficiency and good in sample integrity. The method is suitable for the fields of geotechnical engineering investigation, environment monitoring and the like.

Description

Technical Field

[0001] The invention relates to a soil sampling device for drilling and excavation, and in particular to a soil sampling device for drilling and excavation applied in the field of soil sampling. Background Art

[0002] With the continuous deepening of research on stratum structure and soil properties, how to efficiently obtain undisturbed soil samples during drilling construction or engineering surveys while minimizing disturbance and contamination of samples has become a key demand in the field of geotechnical engineering and geological monitoring. In the existing technology, various sampling devices can meet general drilling sampling requirements, but there is still room for improvement in improving sampling efficiency, sealing quality, and adaptability to various complex strata.

[0003] In order to solve the above problems, many patents have proposed their own improvement solutions, such as: Chinese invention patent CN112855132B discloses a sampling device based on automated mechanical drilling. By setting a rotating motor assembly, a central axis connection assembly, a drill rod assembly and a drill bit assembly, the rigidity of the device is improved, the risk of breakage is reduced, and the secondary fall of soil is effectively prevented, thereby improving the sampling efficiency and quality. However, the design mainly focuses on improving the overall rigidity and sampling stability of the device, and there are still deficiencies in how to further reduce the external disturbance of the sample after extraction, and quickly seal the sample and cut off the deep soil.

[0004] Chinese invention patent CN110439552B discloses a multiphase flow fidelity sampling method and device based on drilling. By laying porous pipes, packers and automatic multi-way valves in the well, the separation sampling of multiphase fluids can be achieved, and oil, water, gas and other fluid samples can be obtained in real time at a fixed depth and with fidelity. Its advantages are simple structure, wide application range and low long-term use cost. However, this device focuses more on multiphase flow fidelity sampling of fluid systems. The integrity and disturbance control of soil samples are not its main considerations, and it cannot meet the needs of many engineering sites for high-integrity soil samples.

[0005] The above designs improve the efficiency and quality of drilling or fidelity sampling by increasing rigidity, enhancing multi-way valve control or multi-hole tube sampling, but they still have certain limitations, such as the lack of rapid sealing and cutting functions of soil samples in the later stage of drilling and susceptibility to downhole environmental pollution. In actual geotechnical engineering surveys and geological monitoring, if the soil samples cannot be sealed or cut off in time, the soil samples will often be disturbed during the extraction process or subsequent transportation and lose their original state. In addition, some devices have complex structures and lack of adaptability to various deep soil types, which often increases the economic cost of equipment maintenance and replacement. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a soil sampling device for drilling and excavation. By arranging a foldable sealing sleeve and a cutting structure inside the device, the deep soil sample in the sampling process can be sealed and quickly cut off in situ, and the erosion of external drilling fluid can be reduced by measures such as multi-channel sealing liquid spraying. The device can be widely used in geotechnical engineering surveys, environmental geological monitoring and other scenarios. While improving the sampling quality and efficiency, it effectively reduces the economic losses caused by soil sampling failure or pollution, and has important promotion value and application prospects.

[0007] A soil sampling device for drilling and opening comprises an outer drill rod, a sampling rod is slidably connected inside the outer drill rod, an outer sampling tube is threadedly connected to the bottom end of the outer drill rod, a sampling drill bit is threadedly connected to the bottom end of the outer sampling tube, a fixed tube is threadedly connected to the bottom end of the sampling rod, a sealing tube is slidably connected inside the fixed tube, a sealing sleeve is contacted with the bottom end of the sealing tube, a fixed tube is contacted with the top end of the sealing sleeve, a guide rod is fixedly connected to the top end of the fixed tube, an outer end of the sealing tube close to the bottom end is slidably connected to a sealing start tube along its axial direction, a plurality of elastic binding bands are provided between the outer wall of the sealing tube and the inner wall of the sealing start tube, and a cutting rod is rotatably connected to the sampling drill bit and the corresponding positions of the elastic binding band.

[0008] The top end of the outer drill rod is fixedly connected to the power part, the top end of the sampling rod is fixedly connected to the outside, a through hole is opened in the sampling rod, and the through hole is connected to the external sealing liquid system.

[0009] The outer end of the external sampling tube has the same diameter as that of the sampling drill bit. The bottom end of the sampling drill bit is a conical structure, and the end with a smaller diameter of the conical structure is arranged on the external sampling tube.

[0010] The sealing sleeve is folded between the sealing tube and the fixed tube, and the central top of the sealing sleeve is in contact with the inner wall of the fixed tube. The bottom end of the sealing sleeve is fixedly connected with a fixing ring, the inner diameter of the fixing ring is larger than the inner diameter of the elastic binding band. The sealing sleeve, the elastic binding band and the fixing ring are all made of elastic materials, and the top of the sealing starting tube is against the bottom end of the fixed tube.

[0011] The outer end of the fixing ring is clamped with the inner wall of the sealing starting tube, the elastic binding band has an arc-shaped structure, and both ends of the arc-shaped structure are fixedly connected to the inner wall of the sealing starting tube. After installation, the elastic binding band is in contact with the outer end of the sealing tube, and multiple elastic binding bands are in a stretched state after installation.

[0012] A sampling hole is opened on the sampling drill bit along its axial direction, and the diameter of the sampling hole is smaller than the inner wall diameter of the fixed tube. A plurality of drill blocks are clamped at the bottom end of the sampling drill bit, and the plurality of drill blocks are distributed in a circular array around the axis of the sampling drill bit.

[0013] The sealing tube is a hollow structure, and the hollow part is filled with sealing liquid. The top of the sealing tube is connected to the inner wall of the sampling rod through a through hole. The top of the guide rod passes through the top of the sealing tube and extends to the upper side of the sealing tube. The outer walls of the sealing tube and the guide rod are provided with sliding grooves to prevent the sealing tube, the guide rod and the sealing start tube from rotating relative to each other.

[0014] The bottom end of the sealing tube abuts against the top end of the sealing sleeve close to the fixed ring. The sealing starting tube, the external sampling tube, the sampling drill bit and the drill block are provided with through holes that are interconnected, and the through hole in the external sampling tube is connected to the inner wall of the external sampling tube. The through hole on the drill block penetrates the drill block, and the direction of the through hole on the drill block is parallel to the axis of the sampling drill bit. The diameter of the through hole on the drill block is smaller than the diameter of the through hole on the external sampling tube, so that the sealing liquid can be sprayed out with a certain pressure.

[0015] The cutting rod is rotatably connected to the sampling drill bit through a rotating shaft. A groove matching the cutting rod is provided at the corresponding positions of the sampling drill bit and the cutting rod. After installation, the length direction of the cutting rod is parallel to the axis of the sampling drill bit. The distance from the top of the cutting rod to the center line of the rotating shaft is equal to the distance from the rotating shaft to the center line of the sampling drill bit. When the length direction of the cutting rod is perpendicular to the axis direction of the sampling drill bit, multiple cutting rods away from the rotating shaft can contact each other to cut off the sample.

[0016] In summary, this application has the following beneficial effects: 1. The external drill rod can be directly connected to the power part, and the external sampling tube and the sampling drill bit can be driven by the sampling rod to perform efficient drilling. The whole is assembled by thread or sliding fit. The connection between the components is compact and the installation and replacement are fast and convenient, which is conducive to high-frequency and multi-point sampling operations on site.

[0017] 2. The bottom end of the sampling drill bit is designed to be a conical structure, and a through hole is opened inside it, so that the sample can smoothly enter the sealing sleeve during the drilling process. The sealing sleeve does not rotate at high speed with the sampling drill bit during sampling, which can better fit and protect the outer end of the sample, significantly reducing the disturbance to the side wall of the sample and ensuring a high degree of sampling integrity.

[0018] 3. By designing a folding structure between the sealing tube, the sealing sleeve and the fixed tube, and the tightening effect of the elastic binding belt, a seal can be quickly formed at the bottom of the sample after the sampling is completed. At this time, the sample is protected in multiple ways to prevent external mud or air from invading and contaminating it, which is especially suitable for sampling scenarios with high soil sensitivity requirements.

[0019] 4. The flip-type cutting rod structure is adopted. Multiple cutting rods can rotate around the axis driven by the sampling drill bit. Fast and uniform circumferential cutting can be achieved through flipping, reducing damage to the bottom of the sample. The design of the flipping mechanism simplifies the operation steps, and the cutting surface is neater and smoother, which is conducive to subsequent geological analysis and testing.

[0020] 5. Connecting channels are designed on the sealing tube, external sampling tube, sampling drill bit and drill block, which can spray out the sealing liquid stored in the sealing tube or transported externally at a certain pressure, playing a comprehensive role of lubrication, flushing and sealing. Such liquid channels can not only remove debris in time and reduce the wear of the cutting surface, but also prevent the secondary infiltration of external mud on the sample, thereby maintaining the original properties of the sample.

[0021] 6. Slide grooves are set on the outer walls of components such as the sealing tube and the guide rod, so that the components can only move axially but cannot rotate relative to each other, thereby ensuring their position accuracy during the sampling and sealing process, thereby further improving the overall reliability of the device and avoiding unnecessary torque loss.

[0022] 7. Key components such as sealing sleeves, elastic binding belts and cutting rods are assembled and fixed in a modular form. They can be easily disassembled and cleaned after use, ensuring that the device can still have efficient sealing and cutting functions during long-term and repeated use. If the site needs to be modified for different strata or special environments, the corresponding components can also be quickly adjusted or replaced based on the original structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the overall structure diagram of this application; Figure 2 This is an overall exploded view of this application; Figure 3 Partial explosion for this application Figure 1 ; Figure 4 Partial explosion for this application Figure 2 ; Figure 5 Partial explosion for this application Figure 3 ; Figure 6 This is the front view of the application; Figure 7 For this application Figure 6 Middle AA section view; Figure 8 For this application Figure 7 Middle BB section view; Fig. 9 For this application Figure 7 Middle CC section view; Fig.10 For this application Figure 7 Middle DD section view; Fig.11 For this application Figure 7 Middle EE section view; Fig.12 For this application Figure 7 Middle FF section view; Fig.13 For this application Figure 7 Enlarged view of point G in the middle; Fig.14 This is the appearance structure diagram of this application.

[0024] Description of the numbers in the figure: 1. External drill rod; 2. Sampling rod; 3. External sampling tube; 4. Sampling drill bit; 5. Fixed tube; 6. Sealing tube; 7. Sealing sleeve; 8. Fixed tube; 9. Guide rod; 10. Sealing start tube; 11. Elastic binding belt; 12. Cutting rod; 13. Fixed ring; 14. Drill block. DETAILED DESCRIPTION

[0025] Three embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] Embodiment 1: like Figures 1 to 14 As shown, this embodiment provides a soil sampling device for drilling and excavation, which mainly includes an outer drill rod 1, a sampling rod 2, an outer sampling tube 3, a sampling drill bit 4, a fixing tube 5, a sealing tube 6, a sealing sleeve 7, a fixing tube 8, a guide rod 9, a sealing start tube 10, an elastic binding belt 11, a cutting rod 12 and a drill block 14 and other components.

[0027] The top of the outer drill rod 1 is fixedly connected to the power part for providing rotational power and axial pressure, and the interior thereof is slidably connected to the sampling rod 2.

[0028] The top of the sampling rod 2 can be fixedly connected to the outside and communicated with the sealing liquid system. By opening a through hole inside the sampling rod 2, the sampling rod 2 can be connected to the external sealing liquid system for transporting sealing liquid to the sealing tube 6 or the sampling drill bit 4 and other parts.

[0029] The external sampling tube 3 is connected to the bottom end of the external drill rod 1 by means of threads, and its bottom end is further connected to the sampling drill bit 4 by means of threads. The outer end of the external sampling tube 3 is equal to the outer end of the sampling drill bit 4 in diameter to keep the overall appearance of the device smooth and reduce interference with the hole wall during drilling.

[0030] The bottom end of the sampling drill bit 4 is in a conical structure, and the smaller end of the conical structure faces the external sampling tube 3, which is used to reduce the disturbance of the soil sample during drilling and sampling. The sampling drill bit 4 is provided with a sampling hole along its axial direction for the soil sample to enter the device. The diameter of the sampling hole is smaller than the inner wall diameter of the fixed tube 8. A plurality of drill blocks 14 are clamped at the bottom end of the sampling drill bit 4. The plurality of drill blocks 14 are distributed in a circular array around the axis of the sampling drill bit 4, which can improve the efficiency of cutting soil layers and crushing rocks.

[0031] The fixed tube 5 is connected to the bottom end of the sampling rod 2 by means of threads, and is used to provide installation and support for components such as the sealing tube 6, the sealing sleeve 7 and the fixed tube 8.

[0032] The bottom end of the sealing tube 6 is in contact with the sealing sleeve 7. The sealing tube 6 can slide inside the fixed tube 5 and has a certain sealing function, so as to achieve sealing and protection of the soil sample during the sampling process.

[0033] The sealing sleeve 7 cooperates with the bottom end of the sealing tube 6 and the fixing tube 8, and is used to wrap around the outer end of the sample during the sampling process, effectively reducing the disturbance to the outside of the soil sample during drilling.

[0034] The top of the fixed tube 8 is fixedly connected with a guide rod 9 and contacts with the top of the sealing sleeve 7, so as to cooperate with the sealing sleeve 7 to move upward with the sample during the sampling and drilling process.

[0035] The guide rod 9 is installed at the top of the fixed tube 8 and is used for guiding and limiting during the sampling process to ensure that the sealing tube 6 and the sealing sleeve 7 always remain coaxial and stable when moving upward.

[0036] The sealing start tube 10 is slidably connected to the outer end of the sealing tube 6 along the axial direction thereof, and the sealing start tube 10 abuts against the bottom end of the fixing tube 5, and a plurality of elastic binding bands 11 are provided inside.

[0037] The elastic binding band 11 is distributed between the outer wall of the sealing tube 6 and the inner wall of the sealing start tube 10, and is used to tighten and compress the sealing sleeve 7 when necessary, and finally achieve the sealing and fixing of the bottom end of the sample.

[0038] The cutting rod 12 is rotatably connected to the sampling drill bit 4 at a corresponding position and is connected to the sampling drill bit 4 through a rotating shaft. When the sample needs to be cut, the cutting rod 12 can cut the sample during the rotation process, so that the soil sample can be separated smoothly in the sealing sleeve 7.

[0039] The core of the above structure is to use the sampling drill bit 4, the drill block 14 and the external sampling tube 3 to perform rotational sampling, which is driven by the external drill rod 1 and the sampling rod 2; after the sampling is completed, the outer end of the sample is closed and protected by the cooperation of components such as the sealing tube 6, the sealing sleeve 7 and the elastic binding belt 11.

[0040] Working process After drilling the wellbore to the target depth using a conventional drill bit, remove the conventional drill bit and replace it with the soil sampling device for drilling and opening according to the present embodiment. Install a sampling rod 2 inside the device, and connect the top of the sampling rod 2 to the external sealing liquid system. At the same time, connect the top of the outer drill rod 1 to the power component to ensure that the outer drill rod 1 can apply force in the axial direction and drive the sampling rod 2, the external sampling tube 3, the sampling drill bit 4 and other components to rotate.

[0041] The outer drill rod 1 starts to rotate and drives the internal sampling rod 2, the outer sampling tube 3, the sampling drill bit 4 and the drill block 14 to rotate together. The conical structure at the bottom of the sampling drill bit 4 and the drill block 14 continuously cut the soil or rock layer, gradually obtaining the required soil sample. During the drilling process, the soil sample enters the device along the sampling hole provided on the sampling drill bit 4 and gradually fills the space where the sealing sleeve 7 is located. Since the sealing sleeve 7 and the fixed tube 8 can slide relatively inside the device, when more soil samples enter, the sealing sleeve 7 will continue to be sleeved on the outer end of the soil sample under the drive of the outer drill rod 1, and move upward with the soil sample and the fixed tube 8 to prevent the soil sample from being excessively disturbed.

[0042] By means of the through hole connecting the inside of the sampling rod 2 with the external sealing liquid system, the sealing liquid can be transferred into the sealing tube 6 through the sampling rod 2 when necessary to locally protect or flush the soil sample entering the sealing sleeve 7 to reduce the contamination of the soil sample by other drilling fluids.

[0043] When the device drills to the required depth and the soil sample has fully entered the sealing sleeve 7, the fixed tube 8 will be pushed by the soil sample to abut against the top of the sealing tube 6, indicating that the sampling depth is in place. If further sealing or cutting of the sample is required at this time, it can be cut through subsequent sealing operations and the cutting rod 12. However, in this embodiment, the main focus is on the basic sampling function and structural layout of the device, so the cutting process and the tightening process of the elastic binding band 11 will only be started when necessary.

[0044] Through the above working process, the operator can quickly and safely obtain relatively complete and less disturbed soil samples in the predetermined stratum, providing necessary data support for subsequent geological analysis or engineering testing.

[0045] The outer drill rod 1 can be directly connected to the power component to drive the sampling rod 2, the outer sampling tube 3 and the sampling drill bit 4 to rotate at high speed. Combined with the cutting action of multiple drill blocks 14, it can efficiently cut into the formation and greatly improve the sampling efficiency.

[0046] The sampling drill bit 4 adopts a conical structure and has a sampling hole. The sample enters the sealing sleeve 7 layer by layer during the drilling process; the conical bottom end of the sampling drill bit 4 and the external sampling tube 3 are reasonably matched, which can effectively reduce the disturbance to the side wall and bottom of the sample, thereby ensuring the integrity of the soil sample.

[0047] The internal through hole of the sampling rod 2 is connected to the sealing liquid system, and when necessary, clean sealing liquid can be delivered to the sealing tube 6 and the sampling drill bit 4 to help isolate the intrusion of external drilling fluid and reduce the pollution effect on the soil sample.

[0048] The outer drill rod 1 is connected to the outer sampling tube 3 by threads; the sampling rod 2, the fixed tube 5 and other components are also threaded or slidably matched. The overall structure is compact and easy to assemble and disassemble on site. At the same time, the outer end of the outer sampling tube 3 is equal to the outer end of the sampling drill bit 4 in diameter, which makes it smoother when rotating in the well wall, facilitating operation and reducing damage to the well wall.

[0049] Although the detailed sealing process of the cutting rod 12 and the elastic binding band 11 is not elaborated in detail in this embodiment, the device itself already has the conditions for sealing, sealing and cutting. Once a higher level of complete sealing is required, the sealing tube 6 and the sealing sleeve 7 can be combined with the flipping and cutting function of the cutting rod 12 to perform higher level packaging and protection of the soil sample.

[0050] In summary, this embodiment realizes the combination of drilling and mining with soil sampling under the premise of ensuring the sampling quality. It has the advantages of high sampling efficiency, good sample integrity, and compact structure. It can be widely used in soil, geotechnical engineering and other fields to provide high-quality soil samples for subsequent engineering design and scientific research.

[0051] Embodiment 2: like Figures 1 to 14 As shown, based on the main structure and sampling function of Example 1, this embodiment further optimizes and improves the sealing sleeve 7, the sealing tube 6, the fixing ring 13, the elastic binding belt 11, the sealing start tube 10 and the cutting rod 12 and other components, so that the device has higher reliability and operability in sealing and cutting.

[0052] The sealing sleeve 7 is installed in a folded manner between the sealing tube 6 and the fixed tube 8, with its central top in contact with the inner wall of the fixed tube 8 and its bottom fixedly connected to the sealing sleeve 7 via a fixing ring 13, so that it can maintain a contracted or wrinkled shape in the initial state, which is convenient for reserving sufficient space for the sample in the initial stage of drilling and sampling. As the sample continues to enter the sealing sleeve 7, the sealing sleeve 7 will gradually unfold and fit tightly against the outer end of the sample.

[0053] The inner diameter of the fixing ring 13 is larger than the inner diameter of the elastic binding band 11, and the fixing ring 13 and the sealing sleeve 7 are both made of elastic material. On the one hand, the elastic material can provide sufficient flexibility to ensure that the sample will not be excessively squeezed when it is pushed inside the device; on the other hand, the existence of the fixing ring 13 can enable the sealing sleeve 7 to form a reliable support and closing structure at the bottom.

[0054] The top end of the sealing start tube 10 abuts against the bottom end of the fixed tube 5. In the subsequent sealing operation, the sealing start tube 10 will abut against the bottom end of the fixed tube 5 when pushed along the axial direction, thereby applying external force to the elastic binding band 11, causing it to detach from the outer end of the sealing tube 6 and tighten the sealing sleeve 7.

[0055] Compared with the first embodiment which only briefly describes the elastic binding belt 11, the present embodiment describes its installation and clamping method in detail.

[0056] The elastic binding belt 11 is an arc-shaped structure, and both ends are fixedly connected to the inner wall of the sealing start tube 10. After installation, the elastic binding belt 11 contacts the outer end of the sealing tube 6 and presents a certain stretching state. The outer end of the fixing ring 13 and the inner wall of the sealing starting tube 10 are mutually clamped in the initial state. The fixing ring 13 and the sealing starting tube 10 can be mutually clamped to ensure that the elastic binding band 11 will not shrink or shift at will when no additional external force is applied. Only when the sealing starting tube 10 is pushed upward will the elastic binding band 11 be driven to separate from the outer surface of the sealing tube 6 and squeeze or seal the bottom end of the sealing sleeve 7.

[0057] In this embodiment, the sealing tube 6 is a hollow structure filled with sealing liquid, and can be connected to the external sealing liquid system through the through hole in the sampling rod 2. In this way, during the sampling and drilling process, the sealing liquid can be injected into the sealing tube 6 and the sampling drill bit 4 or the drill block 14, providing a more complete sealing and isolation effect for the sample.

[0058] The slide groove is designed to prevent relative rotation between the sealing tube 6, the guide rod 9 and the sealing start tube 10. In this embodiment, corresponding slide groove structures are provided on the outer walls of the sealing tube 6 and the guide rod 9. The three can only slide axially and cannot produce relative rotation. This can ensure the positioning accuracy of the sealing tube 6 and the guide rod 9 during drilling, and can also reduce unnecessary torsional interference during sealing and cutting operations.

[0059] Interconnected through holes are provided on the external sampling tube 3, the sampling drill bit 4 and the drill block 14. These through holes are connected to the sealing liquid system, and the diameter of the through holes on the drill block 14 is slightly smaller than the diameter of the through holes on the external sampling tube 3. Such a design is mainly used to spray the sealing liquid from the drill block 14 under a certain pressure during sampling, so as to play a role of timely lubrication and sealing, and help reduce the interference of external fluids such as mud on the sample.

[0060] The bottom end of the sealing tube 6 and the end of the sealing sleeve 7 close to the fixing ring 13 are against each other in the bottom area of ​​the device, and the sealing tube 6 will maintain close contact with the sealing sleeve 7 to ensure that an effective sealing channel can be formed during the downward drilling or upward tightening process.

[0061] The cutting rod 12 is rotatably connected to the sampling drill bit 4 via a rotating shaft, and a groove matching the cutting rod 12 is opened at the corresponding position of the sampling drill bit 4. After installation, the length direction of the cutting rod 12 is parallel to the axis of the sampling drill bit 4. When the cutting rod 12 is flipped to a position perpendicular to the axis of the sampling drill bit 4, its end away from the rotating shaft will come into contact with other cutting rods 12, thereby performing annular cutting of the sample.

[0062] The distance from the top of the cutting rod 12 to the center line of the rotating shaft is equal to the distance from the rotating shaft to the center line of the sampling drill bit 4. This equidistant design can ensure that the cutting rod 12 forms a regular cutting arc when flipping, the cutting action is stable and the force is evenly applied, and additional damage to the sample is reduced.

[0063] Working process Combined with the overall workflow of the aforementioned embodiment 1, this embodiment mainly adds the following sealing and cutting operation steps after the sampling is completed: During continuous drilling, the sample continuously enters the interior of the sealing sleeve 7 through the sampling drill bit 4 and the drill block 14. Since the sealing sleeve 7 is folded, with the central top in contact with the inner wall of the fixed tube 8 and the bottom connected to the fixed ring 13, the sealing sleeve 7 will gradually unfold from the folded state and smoothly cover the periphery of the sample. At the same time, the sample and the sealing sleeve 7 jointly push the fixed tube 8 and the guide rod 9 to move upward until the top of the fixed tube 8 is against the top of the sealing tube 6, indicating that the sampling depth is in place.

[0064] When the sample drilling is completed, the operator can drive the sampling rod 2 to move upward through the outer drill rod 1, so that the fixed tube 8 continues to push the sealing tube 6 upward. At this time, the top of the sealing start tube 10 is against the bottom end of the fixed tube 5, and the elastic binding band 11 is pulled outward from the outer end of the sealing tube 6. Since the elastic binding band 11 is initially in a stretched state, once it is separated from the sealing tube 6, it will tighten the bottom end of the sealing sleeve 7 from all sides under the action of its own elastic force and the sealing start tube 10, so that the sealing sleeve 7 fits more closely to the outer end of the sample.

[0065] As the bottom end of the sealing sleeve 7 is fastened by the elastic binding band 11, the fixing ring 13 generates a certain driving force on the cutting rod 12 under the restoring force of the elastic material, so that the cutting rod 12 is flipped to a position perpendicular to the axis of the sampling drill bit 4 by relying on the rotating shaft. When the sampling drill bit 4 continues to rotate or with the assistance of external force, multiple cutting rods 12 can perform circumferential rotation cutting around the axis of the sampling drill bit 4, thereby cutting off the sample from the underlying stratum. After cutting, the bottom end of the sealing sleeve 7 is in a closed state under the action of elastic force, forming a closed protection for the bottom of the sample.

[0066] During the sampling and cutting process, the sealing liquid filled in the sealing tube 6 will be sprayed out through the reserved through holes on the external sampling tube 3, the sampling drill bit 4 and the drill block 14, which can provide a certain lubrication and isolation effect for the soil sample, avoid direct intrusion of external drilling fluid, and also reduce the damage to the integrity of the sample caused by the cutting action.

[0067] When in use, first drill to the sampling position with a conventional drill bit, then replace the conventional drill bit with the sampling device, and set the sampling rod 2 in the drill rod; When sampling, the sampling rod 2, the external sampling tube 3, the sampling drill bit 4 and the drill block 14 are driven to rotate by the external drill rod 1. The sampling drill bit 4 and the drill block 14 continue to drill during the rotation process. At the same time, the sample to be sampled enters the sealing sleeve 7 from the through hole on the sampling drill bit 4. At this time, the sealing sleeve 7 does not rotate with the sampling drill bit 4, so that the sealing sleeve 7 can be better sleeved on the outer end of the sample to reduce the disturbance to the sample. The conical structure at the bottom end of the sampling drill bit 4 cooperates with the central through hole to better drill the sample and reduce the disturbance to the sample. During the sampling process, as the device continues to descend, the sample continues to enter the sealing sleeve 7, and the sealing sleeve 7 gradually wraps the outer end of the sample. At the same time, the sample and the sealing sleeve 7 continue to push the fixed tube 8 and the guide rod 9 upward until the top of the fixed tube 8 abuts against the top of the inner wall of the sealing tube 6. At this time, the sample drilling is completed; Then, the sealing tube 6 moves upward under the action of the fixed tube 8 until the top of the fixed tube 8 abuts against the bottom of the sampling rod 2. During this process, since the top of the sealing start tube 10 abuts against the bottom of the fixed tube 5, the multiple elastic binding bands 11 are separated from the outer end of the sealing tube 6 under the push of the sealing start tube 10. At this time, the multiple elastic binding bands 11 squeeze the sealing sleeve 7 from multiple directions under the action of their own elastic force, so that the bottom end of the sealing sleeve 7 is tightly attached to the outer end of the sample; Then, the cutting rod 12 is turned over by the elastic force of the fixing ring 13 until its length direction is perpendicular to the axis of the sampling drill bit 4. During the turning process of the cutting rod 12, the multiple cutting rods 12 are driven by the sampling drill bit 4 to continuously rotate around the axis of the sampling drill bit 4, thereby cutting off the sample. After the sample is cut off, the elastic force of the multiple elastic binding bands 11 closes the bottom end of the sealing sleeve 7. During the process of drilling samples, the sealing liquid in the sealing tube 6 continues to flow out through the through hole on the sampling drill bit 4 to seal the sample, reducing the contamination and disturbance of the drilling fluid to the sample. The sealing sleeve 7 is wrapped around the outer end of the sample for sealing, which effectively reduces the disturbance of the sample during the sampling process. There is no relative sliding and rotation between the sealing sleeve 7 and the sample to further reduce the disturbance of the sample. During the sampling process, the sealing sleeve 7 is gradually sleeved on the outer end of the sealing sleeve 7. The sample is automatically cut off after the sampling is completed, thereby improving the integrity of the sample.

[0068] Compared with Example 1, this embodiment realizes a more complete sample sealing mechanism by adding a fixing ring 13 to the outer end of the sealing sleeve 7, and cooperating with an elastic binding belt 11 and a sealing start tube 10. After the soil sample is cut off, it is immediately covered by the bottom end of the sealing sleeve 7, which greatly reduces the secondary disturbance caused by operation or transportation.

[0069] The cutting rod 12 adopts a flip design. Through the cooperation of the fixing ring 13 and the elastic binding belt 11, it can automatically switch from a parallel state to a perpendicular state to the axis of the sampling drill bit 4, and quickly cut off the sample. The flip cutting is not only easy to operate, but also a cutting structure similar to a "ring blade" can be formed between multiple cutting rods 12. The cutting surface is flat and clean, which is more conducive to the subsequent analysis of the sample.

[0070] In this embodiment, connected through holes are added to the external sampling tube 3, the sampling drill bit 4 and the drill block 14, so that the sealing liquid can flow to the sampling area at a certain pressure, thereby achieving lubrication, flushing and isolation effects. In addition, the sealing tube 6 itself is a hollow structure, which can store and continuously provide sealing liquid, further ensuring the cleanliness and stability of the sampling and cutting process.

[0071] The sliding grooves arranged on the sealing tube 6 and the guide rod 9 can prevent relative rotation between the components. At the same time, the action of the elastic binding belt 11 is triggered by the abutment between the sealing starting tube 10 and the fixed tube 5. In each link of sampling and cutting, each component can move in coordination along the predetermined trajectory, reducing the risk of misoperation and the difficulty of assembly.

[0072] Since the fixing ring 13 and the sealing starting tube 10 are mutually clamped, and components such as the elastic binding band 11 can be replaced or reset independently, the entire device can be quickly disassembled for cleaning or repair after use, which is beneficial to subsequent maintenance.

[0073] In summary, this embodiment further improves the sealing, fixing and cutting mechanisms on the basis of Embodiment 1, and realizes rapid and accurate packaging and stable cutting of samples through the synergistic effect of the foldable sealing sleeve 7, the elastic binding belt 11 and the cutting rod 12, which not only maintains the integrity of the soil sample, but also facilitates subsequent storage and transportation, and is suitable for various engineering and scientific research projects that require high-quality soil samples.

[0074] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A soil sampling device for drilling, comprising an outer drill rod (1), characterized in that: The outer drill rod (1) is slidably connected to a sampling rod (2), the bottom end of the outer drill rod (1) is threadedly connected to an outer sampling tube (3), the bottom end of the outer sampling tube (3) is threadedly connected to a sampling drill bit (4), the bottom end of the sampling rod (2) is threadedly connected to a fixing tube (5), the fixing tube (5) is slidably connected to a sealing tube (6), the bottom end of the sealing tube (6) is contacted with a sealing sleeve (7), the top end of the sealing sleeve (7) is contacted with a fixing tube (8), the top end of the fixing tube (8) is fixedly connected to a guide rod (9), the outer end of the sealing tube (6) close to the bottom end is slidably connected to a sealing start tube (10) along its axial direction, a plurality of elastic binding bands (11) are provided between the outer wall of the sealing tube (6) and the inner wall of the sealing start tube (10), and the sampling drill bit (4) is rotatably connected to a cutting rod (12) at a position corresponding to the elastic binding band (11).

2. A soil sampling device for drilling and excavation according to claim 1, characterized in that: The top end of the outer drill rod (1) is fixedly connected to the power part, the top end of the sampling rod (2) is fixedly connected to the outside, a through hole is provided in the sampling rod (2), and the through hole is connected to an external sealing liquid system.

3. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The outer end of the external sampling tube (3) has the same diameter as the outer end of the sampling drill bit (4); the bottom end of the sampling drill bit (4) is a conical structure, and the end with a smaller diameter of the conical structure is arranged on the outer sampling tube (3).

4. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The sealing sleeve (7) is folded and arranged between the sealing tube (6) and the fixed tube (8), and the central top of the sealing sleeve (7) is arranged in contact with the inner wall of the fixed tube (8). The bottom end of the sealing sleeve (7) is fixedly connected to a fixing ring (13), and the inner diameter of the fixing ring (13) is larger than the inner diameter of the elastic binding band (11). The sealing sleeve (7), the elastic binding band (11) and the fixing ring (13) are all made of elastic material. The top end of the sealing start tube (10) is abutted against the bottom end of the fixed tube (5).

5. The soil sampling device for drilling and excavation according to claim 4, characterized in that: The outer end of the fixing ring (13) is mutually engaged with the inner wall of the sealing start tube (10); the elastic binding band (11) is an arc-shaped structure, and both ends of the arc-shaped structure are fixedly connected to the inner wall of the sealing start tube (10); after installation, the elastic binding band (11) is in contact with the outer end of the sealing tube (6); and the plurality of elastic binding bands (11) are in a stretched state after installation.

6. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The sampling drill bit (4) is provided with a sampling hole along its axial direction, and the diameter of the sampling hole is smaller than the diameter of the inner wall of the fixed tube (8). A plurality of drill blocks (14) are clamped at the bottom end of the sampling drill bit (4), and the plurality of drill blocks (14) are distributed in a circular array around the axis of the sampling drill bit (4).

7. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The sealing tube (6) is a hollow structure, and the hollow part is filled with sealing liquid. The top end of the sealing tube (6) is connected to the inner wall of the sampling rod (2) through a through hole. The top end of the guide rod (9) penetrates the top end of the sealing tube (6) and extends to the upper side of the sealing tube (6). The outer walls of the sealing tube (6) and the guide rod (9) are provided with sliding grooves for preventing the sealing tube (6), the guide rod (9) and the sealing start tube (10) from rotating relative to each other.

8. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The bottom end of the sealing tube (6) abuts against the top end of the sealing sleeve (7) close to the fixing ring (13); the sealing start tube (10), the external sampling tube (3), the sampling drill bit (4) and the drill block (14) are provided with through holes that are interconnected, and the through hole in the external sampling tube (3) is connected to the inner wall of the external sampling tube (3); the through hole on the drill block (14) penetrates the drill block (14), and the direction of the through hole on the drill block (14) is parallel to the axis of the sampling drill bit (4); the diameter of the through hole on the drill block (14) is smaller than the diameter of the through hole on the external sampling tube (3), so that the sealing liquid can be sprayed out with a certain pressure.

9. The soil sampling device for drilling and excavation according to claim 1, characterized in that: The cutting rod (12) is rotatably connected to the sampling drill bit (4) via a rotating shaft. A groove matching the cutting rod (12) is provided at corresponding positions of the sampling drill bit (4) and the cutting rod (12). After installation, the length direction of the cutting rod (12) is parallel to the axis of the sampling drill bit (4). The distance from the top of the cutting rod (12) to the center line of the rotating shaft is equal to the distance from the rotating shaft to the center line of the sampling drill bit (4). When the length direction of the cutting rod (12) is perpendicular to the axis direction of the sampling drill bit (4), the ends of the multiple cutting rods (12) away from the rotating shaft can contact each other to cut the sample.

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